The Oni base below Kiyomizudera has been overrun by Tsubakiri's abominations! After fending off one Aguri, a second puts the devoted Kuina out of action. Now it's up to the cowardly Rokuro to get them both out in one piece, but the quivering boy who knelt there just moments ago is no longer. As Rokuro prepares to unleash his terrifying Oni blood, an unsettling, deadly calm spills forth from him...Meanwhile, the rest of the class fights for their lives against the creatures and Momotarou stalking the halls. With their exits cut off, these students are about to receive their first practical combat lesson--one where failure means a fate worse than death...